diff --git a/Userland/Libraries/LibC/locale.h b/Userland/Libraries/LibC/locale.h
index 7f2255c7e2..3f200f9fb4 100644
--- a/Userland/Libraries/LibC/locale.h
+++ b/Userland/Libraries/LibC/locale.h
@@ -17,6 +17,7 @@ enum {
     LC_COLLATE,
     LC_TIME,
     LC_MONETARY,
+    LC_MESSAGES,
 };
 
 struct lconv {